Postdoctoral fellow University Washington, Seattle, 1986—1989. Instructor University Maryland, European Division, Germany, 1989—1991. Visiting scientist University Munich, 1990—1991.
Research associate Duke University Medical School, Durham, North Carolina, 1991—1998. Program director, division cardiovascular science heart failure and arrhythmia branch National Institute Health, Bethesda, since 2007. Faculty Uniformed Service University of Health Sciences, 1998—2007, adjunct faculty, since 2007.